Absorbent footwear material
CA 2257170 A1 · Owner: Russell, William E. · Inventors: Russell, William E.; Sprague, Henry B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An open cell polyurethane, non-swelling foam impregnated or coated into a nonwoven fabric, comprising super absorbent ingredient particles. The disclosed material is a super absorbent, fluid locking moldable footwear product that , takes body fluids away from the surface and gels or locks the fluids in place even while under pressure. The material is breathable and releases fluids through evaporation.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 30, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 30, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.